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Disallow users from sending/recieving external email

Hello, I work in a School in the UK and we have recently implemented a Zimbra server for testing purposes. One of the requirements is that we have the ability to disallow accounts from sending or recieveing email from the internet while still allowing them to send and recieve email internally. Is there any way to do this on a user by user basis?

What about depriving the Zimbra server of DNS resolution? It should still be able to resolve it's own internal domains, but if it had no way of resolving external domains then no messages would leave your site.

Cheers,

Travis

"Let's look at this from a standpoint of "Status". What exactly, on the Space Craft, IS working?"
-Flight Control, Apollo 13

Well yes, I've fudged it in a similar fashion at the moment by firewalling off port 25. However in the long term I will have users who will need external access along with ones who do not. So I'll have to go with controlling it on a smart host.